staging: qlge: Remove page_chunk.last_flag

As already done in ql_get_curr_lchunk(), this member can be replaced by a
simple test.

Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Acked-by: Manish Chopra <manishc@marvell.com>
Link: https://lore.kernel.org/r/20190927101210.23856-4-bpoirier@suse.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>